What are the difference types search engines? How search engines works and popular search engines across the world.

What are the difference types search engines? 

Basically there are three types of search engines:

1. Crawler-based search engines - Crawler-based search engines use automated software agents called crawlers or bots who visits a Website, read the information on the actual site, site's meta tags as well as follow the links that the site connects to performing indexing on all linked Web sites. The crawler returns all that information back to a central depository, where the data is indexed. The crawler will periodically return to the sites to check for any information that has changed.
2. Human-powered search engines - Human-powered search engines rely on humans to submit information that is subsequently indexed and cataloged. Only information that is submitted is put into the index.
3.  Hybrid Search engines – They are a hybrid of the both Crawler-based search engines and Human-powered search engines.

How search engines works?

Search engine is a complex algorithm or a computerized program. They are the key to find particular information on the vast compass of the World Wide Web. Without search engines, it would be virtually impossible to locate anything on the Web without knowing a specific URL. But do you know how search engines work? 

The complex algorithm of search engines use spiders or crawlers or bots who go out hunting websites on internet for their algorithmic search results . These bots or spiders find new websites and pages by following links added on a website. Once a new page is found the bots and spiders reads the pages as well as check images. The entire information related to each page and website is stored in huge online library called as “index”. This indexed data is stored in encoded format to save space. Whenever a user types a search query on search engine search bar. The search engines goes back to its giant index library to fetch the required information. The search engine found millions of matching information, so it uses an algorithm to decide in which order to display results. Everything is ready in less than one second and displayed on SERP(search engine results page). As you all know, content is king! Websites which regularly updated with unique content are given better positions on SERP. Finally the user analyzes the search result and reaches to the website he was looking for.

Google, Yahoo, Bing, Baidu, MSN, Yandex, Naver, etc are the most popular search engines across the world.

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